A transistorized time-division multiplex telegraph set

Increased usage of radio-teletypewriter communication has widened the demand for facilities for multiplexing teletypewriter channels on a single radio channel, for economy of frequency spectrum and equipment. Many of the potential applications of multiplex require smaller and lighter equipment than heretofore available, with unusually high reliability. This paper describes a developmental time-division multiplex equipment which, through the use of transistors, has only 20 per cent of the volume, 20 per cent of the weight, and 5 per cent of the power consumption of the equivalent electron-tube set now in service. The set is packaged for maximum operating convenience and serviceability in the field.